HD64336901G Renesas Technology, HD64336901G Datasheet - Page 222

• Manufacturer Part Number: HD64336901G
• Description: (HD64xxx Series) 16-BIT MICROCONTROLLER
• Manufacturer: Renesas Technology

14.3.7
SSR is a register containing status flags of SCI3 and multiprocessor bits for transfer. 1 cannot be
written to flags TDRE, RDRF, OER, PER, and FER; they can only be cleared.
Rev. 1.00, 11/03, page 194 of 376
Bit
7
6
5
4
Bit Name
TDRE
RDRF
OER
FER
Serial Status Register (SSR)
Initial
Value
1
0
0
0
R/W
R/W
R/W
R/W
R/W
Description
Transmit Data Register Empty
Indicates whether TDR contains transmit data.
[Setting conditions]
[Clearing conditions]
Receive Data Register Full
Indicates that the received data is stored in RDR.
[Setting condition]
[Clearing conditions]
Overrun Error
[Setting condition]
[Clearing condition]
Framing Error
[Setting condition]
[Clearing condition]
When the TE bit in SCR3 is 0
When data is transferred from TDR to TSR
When 0 is written to TDRE after reading TDRE = 1
When the transmit data is written to TDR
When serial reception ends normally and receive data
is transferred from RSR to RDR
When 0 is written to RDRF after reading RDRF = 1
When data is read from RDR
When an overrun error occurs in reception
When 0 is written to OER after reading OER = 1
When a framing error occurs in reception
When 0 is written to FER after reading FER = 1